Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsMAX1617MEE+

Remote/Local Temperature Sensor

with SMBus Serial Interface

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at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com

MAX1617

________________General Description

The MAX1617 is a precise digital thermometer that

reports the temperature of both a remote sensor and its

own package. The remote sensor is a diode-connected

transistor—typically a low-cost, easily mounted 2N3904

NPN type—that replaces conventional thermistors or

thermocouples. Remote accuracy is ±3°C for multiple

transistor manufacturers, with no calibration needed.

The remote channel can also measure the die tempera-

ture of other ICs, such as microprocessors, that contain

an on-chip, diode-connected transistor.

The 2-wire serial interface accepts standard System

Management Bus (SMBus) Write Byte, Read Byte, Send

Byte, and Receive Byte commands to program the alarm

thresholds and to read temperature data. The data for-

mat is 7 bits plus sign, with each bit corresponding to

1°C, in twos-complement format. Measurements can be

done automatically and autonomously, with the conver-

sion rate programmed by the user or programmed to

operate in a single-shot mode. The adjustable rate allows

the user to control the supply-current drain.

The MAX1617 is available in a small, 16-pin QSOP sur-

face-mount package.

________________________Applications

Desktop and Notebook Central Office

Computers Telecom Equipment

Smart Battery Packs Test and Measurement

LAN Servers Multi-Chip Modules

Industrial Controls

____________________________Features

♦ Two Channels: Measures Both Remote and Local

Temperatures

♦ No Calibration Required

♦ SMBus 2-Wire Serial Interface

♦ Programmable Under/Overtemperature Alarms

♦ Supports SMBus Alert Response

♦ Accuracy:

±2°C (+60°C to +100°C, local)

±3°C (-40°C to +125°C, local)

±3°C (+60°C to +100°C, remote)

♦ 3µA (typ) Standby Supply Current

♦ 70µA (max) Supply Current in Auto-Convert Mode

♦ +3V to +5.5V Supply Range

♦ Small, 16-Pin QSOP Package

MAX1617

SMBCLK

ADD0 ADD1

STBY

GND

ALERT

SMBDATA

DXP

DXN

INTERRUPT

TO μC

3V TO 5.5V

200Ω

0.1μF

CLOCK

10k EACH

DATA

2N3904

2200pF

___________________Pin Configuration

N.C. N.C.

STBY

SMBCLK

N.C.

SMBDATA

ALERT

ADD0

N.C.

TOP VIEW

MAX1617

QSOP

DXP

ADD1

DXN

N.C.

GND

__________Typical Operating Circuit

19-1265; Rev 2; 11/12

PART

MAX1617MEE+ -55°C to +125°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

_______________Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

Summary of content (20 pages)

PAGE 1
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface ________________General Description ____________________________Features The MAX1617 is a precise digital thermometer that reports the temperature of both a remote sensor and its own package. The remote sensor is a diode-connected transistor—typically a low-cost, easily mounted 2N3904 NPN type—that replaces conventional thermistors or thermocouples. Remote accuracy is ±3°C for multiple transistor manufacturers, with no calibration needed.
PAGE 2
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V DXP, ADD_ to GND ....................................-0.3V to (VCC + 0.3V) DXN to GND ..........................................................-0.3V to +0.8V SMBCLK, SMBDATA, ALERT, STBY to GND ...........-0.3V to +6V SMBDATA, ALERT Current .................................-1mA to +50mA DXN Current ................................
PAGE 3
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.3V, TA = 0°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS SMBus INTERFACE Logic Input High Voltage STBY, SMBCLK, SMBDATA; VCC = 3V to 5.5V Logic Input Low Voltage STBY, SMBCLK, SMBDATA; VCC = 3V to 5.5V Logic Output Low Sink Current ALERT, SMBDATA forced to 0.4V ALERT Output High Leakage Current ALERT forced to 5.
PAGE 4
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.3V, TA = -55°C to +125°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS SMBus INTERFACE VCC = 3V 2.2 VCC = 5.5V 2.4 Logic Input High Voltage STBY, SMBCLK, SMBDATA Logic Input Low Voltage STBY, SMBCLK, SMBDATA; VCC = 3V to 5.5V Logic Output Low Sink Current ALERT, SMBDATA forced to 0.4V ALERT Output High Leakage Current ALERT forced to 5.
PAGE 5
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface ____________________________Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) 20 VIN = 50mVp-p VIN = 25mVp-p 0 10 VIN = 10mVp-p SQUARE WAVE APPLIED TO DXP-DXN TEMPERATURE ERROR (°C) TEMPERATURE ERROR (°C) VIN = 100mVp-p MAX1617TOC03 VIN = SQUARE WAVE AC COUPLED TO DXN TEMPERATURE ERROR (°C) 5 MAX1617TOC05 30 10 TEMPERATURE ERROR vs. DIFFERENTIAL-MODE NOISE FREQUENCY TEMPERATURE ERROR vs.
PAGE 6
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface ______________________________________________________________Pin Description PIN NAME FUNCTION 1, 5, 9, 13, 16 N.C. No Connection. Not internally connected. May be used for PCB trace routing. 2 VCC Supply Voltage Input, 3V to 5.5V. Bypass to GND with a 0.1µF capacitor. A 200Ω series resistor is recommended but not required for additional noise filtering.
PAGE 7
Maxim Integrated ALERT GND DXN DXP VCC REMOTE TEMPERATURE DATA REGISTER DIODE FAULT LOCAL REMOTE - + Q R S DIGITAL COMPARATOR (REMOTE) 8 LOW-TEMPERATURE THRESHOLD (REMOTE TLOW) 8 HIGH-TEMPERATURE THRESHOLD (REMOTE THIGH) 8 - + - + MUX ADC 8 CONTROL LOGIC SELECTED VIA SLAVE ADD = 0001 100 DIGITAL COMPARATOR (LOCAL) 8 LOW-TEMPERATURE THRESHOLD (LOCAL TLOW) HIGH-TEMPERATURE THRESHOLD 8 (LOCAL THIGH) LOCAL TEMPERATURE DATA REGISTER MAX1617 2 8 READ ALERT RESPONSE ADDRESS REGIS
PAGE 8
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface A/D Conversion Sequence If a Start command is written (or generated automatically in the free-running auto-convert mode), both channels are converted, and the results of both measurements are available after the end of conversion. A BUSY status bit in the status byte shows that the device is actually performing a new conversion; however, even if the ADC is busy, the results of the previous conversion are always available.
PAGE 9
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface PCB Layout 1) Place the MAX1617 as close as practical to the remote diode. In a noisy environment, such as a computer motherboard, this distance can be 4 in. to 8 in. (typical) or more as long as the worst noise sources (such as CRTs, clock generators, memory buses, and ISA/PCI buses) are avoided. 2) Do not route the DXP–DXN lines next to the deflection coils of a CRT.
PAGE 10
MAX1617 MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface the MAX1617 can be forced to perform A/D conversions via the one-shot command, despite the RUN/STOP bit being high. Activate hardware standby mode by forcing the STBY pin low. In a notebook computer, this line may be connected to the system SUSTAT# suspend-state signal. The STBY pin low state overrides any software conversion command.
PAGE 11
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface Table 2. Data Format (Twos-Complement) TEMP. (°C) ROUNDED TEMP. (°C) DIGITAL OUTPUT DATA BITS SIGN MSB LSB +130.00 +127 0 111 1111 +127.00 +127 0 111 1111 +126.50 +127 0 111 1111 +126.00 +126 0 111 1110 +25.25 +25 0 001 1001 +0.50 +1 0 000 +0.25 +0 0 +0.00 +0 -0.25 Table 3.
PAGE 12
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface Table 4.
PAGE 13
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface Table 5. Configuration-Byte Bit Assignments Table 7. Conversion-Rate Control Byte DATA CONVERSION RATE (Hz) AVERAGE SUPPLY CURRENT (µA typ, at VCC = 3.3V) BIT NAME POR STATE 7 (MSB) MASK 0 Masks all ALERT interrupts when high. 00h 0.0625 30 01h 0.125 33 02h 0.25 35 03h 0.5 48 0 Standby mode control bit. If high, the device immediately stops converting and enters standby mode.
PAGE 14
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface Table 8. RLTS and RRTE Temp Register Update Timing Chart OPERATING MODE CONVERSION INITIATED BY: NEW CONVERSION RATE (CHANGED VIA WRITE TO WCRW) TIME UNTIL RLTS AND RRTE ARE UPDATED Auto-Convert Power-on reset n/a (0.
PAGE 15
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface A tLOW B C tHIGH E D F G H I J K M L SMBCLK SMBDATA tSU:STA tHD:STA tSU:DAT A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT CLOCKED INTO SLAVE E = SLAVE PULLS SMBDATA LINE LOW tHD:DAT tSU:STO tBUF J = ACKNOWLEDGE CLOCKED INTO MASTER K = ACKNOWLEDGE CLOCK PULSE L = STOP CONDITION, DATA EXECUTED BY SLAVE M = NEW START CONDITION F = ACKNOWLEDGE BIT CLOCKED INTO
PAGE 16
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface Listing 1.
PAGE 17
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface Listing 1.
PAGE 18
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface Listing 1.
PAGE 19
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 16 QSOP Maxim Integrated PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 20
MAX1617 Remote/Local Temperature Sensor with SMBus Serial Interface Revision History REVISION NUMBER REVISION DATE 2 11/12 DESCRIPTION Updated Electrical Characteristics tables (added new Note 1); updated ADC and Multiplexer and Remote-Diode Selection sections PAGES CHANGED 2–4, 6, 8 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied.